2,3-dicyano-5,6-dichloro-p-benzoquinone; montmorillonite K in toluene T=20°C; 20 h;

4-(N,N-dimethlyamino)pyridine; (2,6-Me(NO2)PhCO)2O; triethylamine in dichloromethane T=20°C; 20 h;

4-(N,N-dimethlyamino)pyridine in benzene T=20°C;

caesium carbonate in N,N-dimethyl-formamide T=20°C; Esterification; 3 h;

4-(N,N-dimethlyamino)pyridine; 2-azidoethanol in dichloromethane T=20°C;

1: 3-phenyl-2E-propenoic acid; 2,4,6-trichlorobenzoyl chloride With triethylamine in tetrahydrofuran T=20°C; Yamaguchi reaction; Inert atmosphere; 2: Hydrocinnamic alcohol With 4-(N,N-dimethlyamino)pyridine in benzene T=20°C; Yamaguchi reaction; Inert atmosphere; chemoselective reaction;

1,3-dibenzyl-1H-benzo[d]imidazol-3-ium chloride; caesium carbonate in 1,4-dioxane T=20°C; 3 h; Inert atmosphere; stereoselective reaction;

1: Et3N / tetrahydrofuran / 20 °C 2: 82 percent / 4-(dimethylamino)pyridine / benzene / 20 °C View Scheme